Consistency Control Method for Virtual Synchronous Generator with State Predictor

Abstract

The invention discloses a state predictor-containing control method for consistency of virtual synchronous generators. The control method comprises the steps of determining a first output difference value <delta>yi according to the output power Pi and the rated power Pi<*> of the i virtual synchronous generator (VSG); determining a second output difference value <delta>Yi according to the first output difference value <delta>yi and a droop characteristic curve translation amount Yi of the i VSG, wherein the droop characteristic curve translation amount Yi is regulated by the second output difference value <delta>Yi and a consistency control parameter Qi; determining an output angular frequency <delta> <omega>i according to the second output difference value, a damping coefficient D<p, i> of the i VSG, the rated angular frequency <omega>b, an actually measured angular frequency <omega>i, and a virtual rotation inertia Ji; and determining an angle <theta>i according to the actually measured angular frequency <omega>i, and influencing the output power Pi and the consistency convergence speed according to the angle <theta>i. According to the state predictor-containing control method for the consistency of the virtual synchronous generators, the droop characteristic curve translation amount Yi is regulated by the second output difference value <delta>Yi and the consistency control parameter Qi, so that the convergence speed can be accelerated and the convergence value can be achieved rapidly.

Description

technical field [0001] The invention relates to the technical field of virtual synchronous generators, in particular to a consistent control method for virtual synchronous generators with a state predictor. Background technique [0002] As the scale of distributed power continues to increase, more and more power sources with inverters as the main interface are connected to microgrids. Traditional inverters have almost no moment of inertia, and it is difficult to provide inertia and damping for the grid, so they cannot meet the needs of supporting frequency and voltage. When a large number of distributed power sources are connected to the microgrid, it will pose a huge threat to the safe and stable operation of the microgrid. The control strategy of grid-connected inverter based on virtual synchronous generator (Virtual Synchronous Generator, VSG) can provide inertia and damping for microgrid. The virtual synchronous generator technology based on consistency can realize the...

AI Technical Summary

Problems solved by technology

The virtual synchronous generator technology based on consistency can realize the consistent restoration of system frequency and the reasonable distribution of active power output through the communication between adjacent VSGs. However, due to the lack of consideration of the uniform convergence speed of the system, the system convergence speed is slow

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